The seam in the French model sits where any maritime authority must end: at the low-water mark. Because France treats the sea as territory, this seam is managed within a single administrative idiom rather than across institutional cultures. That is the part of the French model the UK cannot import wholesale, and the part that an honest British adaptation must engineer. The first is incremental and well within reach: extend the SOSREP model, in statute and in resource, to cover offshore energy and potentially other infrastructure. The second is more ambitious: revive a regional civil-military authority for security and safety in UK territorial waters.